According to a note in the International Plant Names Index, Rosa uncinella is a synonym of R. canina.

The 1823 reference in Rosacearum monographia describes R. uncinella as native to the Caucasus. It was later identified in northern England in 1863.

In a lengthy article in French published in Bulletin de la Société Royale de Botanique de Belgique, Volume 17 (1878), Crépin published a proposed revision of the names of roses of Besser and von Bieberstein, including R. uncinella. Crépin listed it as a synonym of Rosa canina (p. 275) based on a review of Marschall von Bieberstein's herbarium. To read the article in French, see "Primitiae Monographiae Rosarum - Matériaux Pour Servir À L'Histoire Des Roses, XIII - Révision des Roses de Besser et de Marschall von Bieberstein," at p. 221 ff.

The following monograph (in Latin) is offered in:
Rosacearum monographia By Leopold Trattinnick
Published by Heubner, 1823

Via Google Books,
http://books.google.com/books?id=U3IFAAAAQAAJ&dq=%22rosa+uncinella%22&source=gbs_summary_s&cad=0

Rosa uncinella. Bessr Catl. hort. Crem. a 1811. suppl. 4. p.21 et Cat. a. 1816. p.119. M. B. Fl. taur. caucas. III. 349.

Foliola non vere sunt biserrata, sed potius inaequaliter serrata, ut minores serraturae majoribus quandoque inhaereant, quod quidem et in R. collina atque ipsa canina sic passim obtinet. Villositate variat, ita quidem, ut foliolorum subtus mox tantum costa venaeque, mox tota inferior pagina pubescat. Caeterum habitu, floris et amplitudine segmentorum calycinorum R. calycinae proxima est. Utraque secundum specimen R. venosae Swartsii authenticum, mihi ab amicissimo Steveno communicatum, huic perquam etiam affinis est, et ulteriori indiget cum hac comparatione. Bieberst. l. c.

Hab. in Tauria, inter congeneres minime rara. In definitione Besseriana urceolus ellipticus, aculei caulini validi et folliola elliptica, acutinuscula, biserrata, costa, petiolisque pubescentibus. Affinis R. collinae. T.

Differt a R. canina, cui proxima, petiolis, aculeis magis aduncis, calycum laciniis maximis, caeterum viredine laeta foliorum et rubedine ramorum. Legi cum R. balsamica (R. Klukii.) Bess. En. pl. Volhuyn. etPodol. p.20 Vid. etiam Praefationem Ti praesntis.